In a Peruvian campaign to improve public health in rural areas, one key challenge was to convince isolated villagers to boil their drinking water in order to kill parasites. In a pilot study, this effort largely failed. Government caseworkers lectured the villagers about germ theory, but villagers associated hot foods with illness and didn't like the taste of boiled water. The only families who adopted the practice were not well integrated into the village and had few connections to their neighbors. What does this demonstrate?

That the Social ties not only connect us to others but they also  influence our behavior

Explanation:

According to the given question, the Peruvian campaign is one of the type of program that helps in improve the public health in the various types of rural areas like small villages.

 The main objective of this campaign is to provide awareness about the germs in the drinking water so the members of this campaign take the initiate to convince to villagers to boil water before drink water so this type of scenario is basically demonstrating about the social ties.

 The social ties helps in adopting the practices and also provide awareness to the neighborhood people so the social ties helps in connecting the people each other and also influences the behavior.

 Therefore, the given answer is correct.  

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.

answer; does not include a reference to the audience;